Join Date: Feb 2012
Location: Houston, TX
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Re: Propeller Drag - Challenging my intuition
An MIT study referenced by the OP's citation estimated that prop speed of a free-wheeling propeller was 95% of the prop speed required to move a boat at the same speed under power. So, whether sailing or motoring, the free-wheeling propeller is spinning at essentially the same rate. If this is the case, the folding prop might not stay folded. Besides, the whole point in getting a folding prop is to reduce drag when under sail and not have the shaft spinning. If you are going to let your prop spin, I don't see the reason for having a folding prop.
[/B]S/V Wind Orchid
Catalina 350 (hull# 273)
LET'S GET SERIOUS ABOUT REMOVING POLITCAL TAG LINES -- NOW!